Synthesis and Performance of Li 2 MnSiO 4 as an Electrode Material for Hybrid Supercapacitor Applications

Abstract

Li2MnSiO4 was synthesized using the solid-state method under an Ar atm. at three different calcination temps. (900, 950, and 1000°C). The optimization of the carbon coating was also carried out using various molar concns. of adipic acid as the carbon source. The XRD pattern confirmed that the resulting Li2MnSiO4 particles exhibited an orthorhombic structure with a Pmn21 space group. Cyclic voltammetry was utilized to investigate the capacitive behavior of Li2MnSiO4 along with activated carbon (AC) in a hybrid supercapacitor with a two-electrode cell configuration. The Li2MnSiO4/AC cell exhibited a high discharge capacitance and energy d. of 43.2 Fg-1 and 54 Whkg-1, resp., at 1.0 mAcm-2. The Li2MnSiO4/AC hybrid supercapacitor exhibited an excellent cycling stability over 1000 measured cycles with coulombic efficiency over > 99 %. Electrochem. impedance spectroscopy was conducted to corroborate the results that were obtained and described. [on SciFinder(R)]